Surface-Enhanced Raman Spectroscopy and Nanogeometry: The Plasmonic Origin of SERS
The Journal of Physical Chemistry C2007Vol. 111(49), pp. 17985–17988
Citations Over TimeTop 10% of 2007 papers
Abstract
Using a series of highly regular nanostructures consisting of periodic Ag nanowires fabricated in porous aluminum oxide, we validate the overwhelmingly plasmonic origin of the most intense SERS signals such as those responsible for single-molecule SERS, demonstrating its sensitive dependence on the system's nanogeometry. By varying the interwire gap distance from 35 to 10 nm, the SERS intensity excited with 785 nm laser light, increased over 200-fold. These observations were shown to agree quantitatively with electromagnetic field calculations carried out using the free space green's tensor method.
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